Which of the following statements are correct? (i) Sound is produced by vibrations. (ii) Sound requires a medium for propagation. (iii) Light and sound both require a medium for propagation. (iv) Sound travels slower than light. (a) i & ii only (b) i, ii & iii only (c) ii, iii & iv only i, ii & iv only
ScienceClass 8CBSEAnswered 28 Mar 2026
Answer
Answer is (d) i, ii & iv only
Explanation:
Statement iii) is wrong because light and sound are two different entities.
Suggested Q&A
Science · Class 8- ScienceClass 8List the seven basic practices of crop production in their correct sequence.
- ScienceClass 8What is the main difference between a 'godown' and a 'silo' for grain storage?
- ScienceClass 8Explain how a sprinkler system works and for what type of terrain it is most suitable.
- ScienceClass 8What is the primary purpose of preparing the soil before sowing seeds?A. To add nutrients to the soil.B. To loosen the soil, allowing for better root penetration.C. To remove all weeds from the field.D. To compact the soil for better water retention.
- ScienceClass 8Fill in the blanks to complete the following paragraph. The name of the product formed in the reaction of sulphur and is sulphur dioxide gas. When sulphur dioxide is dissolved in , sulphurous acid is formed. The sulphurous acid turns litmus paper to Generally oxides of are acidic in nature. After completing the paragraph write two questions which you can raise on the basis of this information.
- ScienceClass 8Some of the following statements are incorrect. Find the incorrect statements and correct them. (a) The property of metals by virtue of which they can be drawn into wires is called ductility. (b) Metals are good conductor of electricity but poor conductor of heat. (c) Articles made of metals produce ringing sound when struck hard. (d) Oxides of non-metals and metals are acidic in nature. (e) A less reactive metal replaces a more reactive metal from its salt solution in water.